Lead can enter water between the well and the tap
Lead in a private-well system can come from lead-containing pipes, solder, fixtures or well components. Corrosive groundwater can help release it. The CDC recommends inspecting the whole system and identifying potential sources instead of assuming that the aquifer or a single faucet explains the result. CDC: Lead in private well systems.
Water chemistry, plumbing materials and the time water spends in pipes affect how much lead reaches a tap. A house’s age or the appearance of its pipes cannot replace testing. Ask a plumber or well professional about the materials in the complete water system. Health Canada: Lead in drinking water.
Reduce exposure while you investigate
If lead is found, the CDC advises measures such as using a suitable point-of-use filter or bottled water certified by an independent testing organisation. Ask the health department which water source and precautions are appropriate for the household while the system is investigated. CDC: Lead in private well systems.
Use cold water for drinking, cooking and making formula. Boiling does not remove lead. A filter must be certified for lead reduction, installed correctly and maintained on schedule; do not run hot water through it. These measures require the right equipment and use, not just a generic filter label. EPA: Lead in drinking water.
Children are particularly vulnerable to lead exposure. If there is a concern about a child’s exposure, contact the child’s doctor; the doctor can decide whether a blood test or other follow-up is needed. A tap-water measurement cannot determine a person’s blood lead level. CDC: Lead in private well systems.
Health Canada advises testing water if someone is pregnant or breastfeeding and lead is suspected. If the result exceeds its guideline, arrange an alternative drinking-water source or appropriate treatment and contact a health professional or public health authority about concerns. Health Canada: Lead in drinking water.
Understand what a result means
Health Canada’s guideline for total lead is 0.005 mg/L, equivalent to 5 µg/L. It also calls for concentrations to be kept as low as reasonably achievable and states that there is no known safe exposure level. Read the units on the report carefully when comparing results. Health Canada: Drinking-water guideline tables.
EPA’s health goal for lead in drinking water is zero. Public-system action levels are used to trigger system responses; they are not a personal safe-to-drink threshold for a private well. Review a detected result with the local health authority rather than waiting for it to cross a public-system action number. EPA: Lead in drinking water.
Use a sampling plan that answers the right question
The CDC recommends a state-approved tap-water sampling protocol for private wells, using EPA’s protocol if no state protocol exists, and a certified laboratory. Ask the laboratory for the instructions before collecting a sample; the test needs to reflect the question being investigated. CDC: Lead in private well systems.
In Canada, use an accredited laboratory or your public health unit and follow all collection, storage and delivery instructions. Sampling and chemical retesting frequency depend on the circumstances. Do not substitute a universal flushing or overnight-standing recipe for the protocol supplied for your investigation. Health Canada: Testing well water.
Ask the professional organising the investigation which taps and parts of the system need sampling, and whether different samples are intended to estimate exposure or locate a source. Keep the sampling instructions and results together so later tests can be interpreted in context. Health Canada: Testing well water.
Use flushing with the right expectations
Running water that has stood in plumbing can reduce exposure, but the amount of time needed depends on the system. EPA advises obtaining local recommendations. Flushing is not a laboratory result or a guarantee that a tap is free of lead. EPA: Lead in drinking water.
Choose a filter with a specific lead claim
NSF advises checking both the standard and the particular contaminant-reduction claim. Confirm that the exact model is certified for lead reduction; certification for taste, odour or a different contaminant does not establish that. Include the correct replacement cartridge and its replacement schedule in the purchase decision. NSF: Choosing home water treatment.
Point-of-use equipment treats water at the outlet where it is installed. Point-of-entry equipment treats water as it enters the home. If plumbing inside the home is releasing lead, treatment placed before that plumbing does not address the later source. Plan the treatment location with the professional investigating it. NSF: Choosing home water treatment.
Health Canada recommends testing the water before and after treatment through an accredited laboratory and maintaining the equipment according to the manufacturer’s instructions. A device’s certification supports its stated performance; it does not replace testing of the household installation. Health Canada: Treating well water.
Address the source and check the result
Health Canada identifies replacement of lead-containing plumbing materials as a long-term measure. The appropriate work depends on the source. Ask a qualified professional about affected pipes, fittings and well equipment, and about water chemistry when corrosion is involved. Health Canada: Lead in drinking water.
Filters require continuing maintenance and are not permanent removal of the underlying plumbing source. Keep exposure-reduction measures in place while the problem is being resolved, and arrange follow-up testing with the responsible health authority or laboratory before relying on the completed work. Health Canada: Lead in drinking water.
Bathing and other uses
EPA says bathing and showering are generally safe in water containing lead because skin does not absorb lead from water. It also notes that individual circumstances, including highly corrosive water, can require different advice. Follow local guidance and do not assume advice about lead clears other contaminants. EPA: Lead in drinking water.
Sources checked: 7 September 2026 (UTC).